/*
 * This file is part of the eccOS Library.
 * Copyright (C) 2007.
 *
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 */
package org.openeccos.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

/**
 * @author Demián Gutierrez
 */
public class PDImageLoader {

	private static PDImageLoader instance;

	private Map imageMap = new HashMap();

	private PDImageLoader() {
		// Empty
	}

	public static PDImageLoader getInstance() {
		if (instance == null) {
			instance = new PDImageLoader();
		}

		return instance;
	}

	public InputStream getAsInputStream(String name) throws IOException {
		return new ByteArrayInputStream(getAsByteArray(name));
	}

	public URL getAsURL(String name) throws IOException {
		return getClass().getResource(name);
	}

	public byte[] getAsByteArray(String name) throws IOException {
		byte[] image = (byte[]) imageMap.get(name);

		if (image == null) {
			ByteArrayOutputStream baos = new ByteArrayOutputStream();

			ClassLoader cl = getClass().getClassLoader();
			InputStream is = cl.getResourceAsStream(name);
			byte[] buffer = new byte[512];

			int count;
			while ((count = is.read(buffer)) > 0) {
				baos.write(buffer, 0, count);
			}

			image = baos.toByteArray();
			imageMap.put(name, image);
		}

		return image;
	}
}